I've searched around, and I can't seem to find an answer to this question. It's a technical one.

I have XBox live, and Rainbow Six 3. I directly plug my ethernet cable into the back of the XBox from my cable modem. When playing RS3, I hear everybody and can chat when I'm in the lobby, but when I play, I hear nothing except for an occasional word. They can hear me fine. I have a feeling this is a lag problem, but I have no other lag in the game (occasional choppiness if I'm in a huge game with 10+ players, but that's it). My cable provider says that XBox live is supported by them, and that there shouldn't be problems.

The only other thing that I can think of is for some reason my cable modem isn't compatible. I know that this problem happens with some routers, but I am not using a router. Does anybody know if there is a list of cable modems that work/don't work with XBox live? I have a Hitron Tech BRG 3520, provided to me by the cable company.

No other XBox live game I have acts this way. Does anybody know of a fix, or am I screwed when it comes to RS3? Thanks in advance if anybody out there is smart.